The Berlin Wall

The Berlin Wall:

A) was built with the cooperation of West Germany and her western allies, who sought to improve relations with the Soviet Union.
B) was torn down in 1989 by a group of Soviet protestors.
C) was erected in 1961 by the Soviets to stem the rising tide of emigration from East Berlin to West Berlin.
D) became an unlikely symbol of hope that one day the Cold War would end.
E) was a temporary defensive measure enacted after a series of riots.